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前端将文件分成多个块，并将每个块上传到服务器。
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服务器使用Node.js创建一个HTTP服务器或Express服务器。
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在服务器端，我们可以使用Multer或Busboy模块来处理上传的文件块。
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在文件上传完成之后，我们可以使用fs模块的createWriteStream()方法来将文件块写入磁盘。
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当所有文件块都上传并写入磁盘后，我们可以使用fs模块的createReadStream()方法来读取所有文件块，并使用它们来创建完整的文件。
const express = require('express');
const multer = require('multer');
const fs = require('fs');const app = express();
const upload = multer({ dest: 'uploads/' });app.post('/upload', upload.array('file'), (req, res) => {const files = req.files;const fileNames = [];// 将文件块写入磁盘files.forEach((file, index) => {const fileName = `uploads/${file.originalname}-${index}`;fs.createWriteStream(fileName).write(file.buffer);fileNames.push(fileName);});// 读取所有文件块并合并成完整的文件const writeStream = fs.createWriteStream('uploads/full-file');fileNames.forEach((fileName) => {const readStream = fs.createReadStream(fileName);readStream.pipe(writeStream, { end: false });readStream.on('end', () => {fs.unlinkSync(fileName);});});writeStream.on('finish', () => {res.send('File uploaded and merged successfully');});
});
)
